Separation of chromium and nickel ions by supported liquid membranes using TOA as carrier
The extensiveuse of chromium in leather tanning, metallurgy, electroplating and otherindustries has resulted in the release of aqueous chromium to the subsurface atnumerous sites. Cr (VI) has received considerable attention owing to itsextensive industrial applications and has long been recognised a...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Kyrgyz Turkish Manas University
2019-06-01
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| Series: | MANAS: Journal of Engineering |
| Subjects: | |
| Online Access: | https://dergipark.org.tr/en/download/article-file/738098 |
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| Summary: | The extensiveuse of chromium in leather tanning, metallurgy, electroplating and otherindustries has resulted in the release of aqueous chromium to the subsurface atnumerous sites. Cr (VI) has received considerable attention owing to itsextensive industrial applications and has long been recognised as a toxicsubstance due to its strong oxidisingpotential and the ease with which it can cross the biological membranes.In recent years the application of various solvent extraction technologies tothe removal and concentration of chromium have been widely studied; chemicalprecipitation, ion exchange, reverse osmosis, diffusion dialysis, adsorption,liquid membrane technique are some of the alternatives that have been reportedin the literature. Recently supportedliquid membrane (SLM) extraction is an alternative to conventional solvent extraction due toits advantages like high selectivity, operational simplicity, low solventinventory, low energy consumption, zero effluent dischargeand combination of extraction andstripping into one single unit. In this workthe selective separation of chromium from acidic media, containing themixtures of chromium and nickel by SLMwas investigated using TOA (tri-octylamine) as carrier. The liquid membrane wasconsisted of the desired concentration of an extractant (TOA), a modifier (TBP), and adiluent (chloroform, kerosene, cyclohexane). The membrane support wasmicroporous hydrophobic polypropyleneCelgard 2500. Such parameters as, the solvent type, feed solution pH,extractant (TOA) concentration, modifier (TBP) concentration and temperaturewere experimentally studied and the optimum conditions were determined. Thepermeation coefficients (P) and the initial fluxes of chromium (Jo) werecalculated. Separation factors ofchromium over nickelwas calculated from theexperimental measurements. |
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| ISSN: | 1694-7398 |